The fission reaction among the options provided is option C. In the fission reaction, a heavy nucleus like uranium-235 absorbs a neutron to split into smaller parts, releasing energy and additional neutrons. In option C, uranium-235 absorbs a neutron and breaks into lighter elements like barium-141, krypton-92, and three neutrons, making it a fission reaction. Option A is a fusion reaction, which involves combining lighter nuclei to form a heavier nucleus, as seen when hydrogen-2 and hydrogen-3 combine to form helium-4 and a neutron. Option B is not a fusion or a fission reaction and involves the combination of two elements to form a new compound. Option D is a cellular respiration process and not a nuclear reaction, making it unrelated to the other options.